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Three-dimensional image measuring apparatus

Three-dimensional image measuring apparatus description/claims

This application is a continuation of U.S. patent application Ser. No. 10/542,919 which is a National Stage filing of PCT/KR2004/000204 which claims priority to Korean Application No. 2003-0007571 filed Feb. 6, 2003 and Korean Application No. 2003-007570 filed Feb. 6, 2003. The contents of the above applications are incorporated by reference.

The present invention relates to a three-dimensional image measuring apparatus, more particularly, to a three-dimensional image measuring apparatus in which when measuring a three-dimensional image of a measuring object, a grating image is distributed and thereafter the distributed image is scanned alternately to a side and the other side of the measuring object, thereby capable of removing a shadow region generated when measuring the three-dimensional image.

A conventional art relating to the three-dimensional image measuring apparatus is disclosed in U.S. Pat. No. 4,794,550(filed on Oct. 15, 1986, applicant: Eastman Kodak Company), which will be described hereinafter in accordance with an accompanying drawing.

FIG. 1 is a construction view of the three-dimensional image measuring apparatus in accordance with a conventional art. As shown in FIG. 1, light generated from a light source 1 is irradiated as horizontal light beam 1a having a period “d” of the grating image onto a surface 9 of the measuring object through a grating 2, which is moved toward “a” direction of an arrow by a grating transfer member 4, and a lens 3. The irradiated light is scattered by angle 1b and irradiated to a camera 7 having an image sensor 6 through a lens 5 and then a sample image is obtained. The obtained sample image is processed by a computer 8 and then a three dimensional image of the surface 3 of the measuring object is obtained and then the obtained three dimensional image is displayed by a display device 8b. Here, a keyboard 8a is used for inputting several information in order to measure moire pattern.

As described above, there are several disadvantages that when measuring the three dimensional image by using the conventional moire pattern, there is a shadow region, which is impossible to measure, at an arbitrary position of the measuring object, so that the three dimensional image of the measuring object can not be measured precisely.

Accordingly, it is a primary object of the present invention to provide a three dimensional image measuring apparatus in which when measuring a three-dimensional image of a measuring object, a grating image is distributed and thereafter the three dimensional image changed by the measuring object is obtained by scanning the distributed image by N times to a side and the other side of the measuring object, thereby obtaining three dimensional image, so that a shadow region is removed, thereby capable of more improving measuring precision of the three-dimensional image.

Another object of the present invention is to provide a three dimensional image measuring apparatus in which a projection portion and a 3-dimensional camera are arranged on a straight line, thereby constructing the three dimensional image measuring apparatus more compact.

In one aspect of the present invention, to achieve the above-described objects of the invention, there is provided a three-dimensional image measuring apparatus comprising: an XYZ shaft transfer means mounted onto a base member; a work stage mounted to the base member, for moving a measuring object to a measuring position and thereafter supporting it and having a predetermined reference surface set at a side thereof; an image obtaining means in which it is moved toward X,Y and Z shafts by the XYZ shaft transfer means, scans a grating image by the frequency of N times to a side of the measuring object supported and fixed to the work stage, obtains the changed grating image by the measuring object by N times and alternately, scans the grating image by the frequency of N times to the other side of the measuring object, obtains the changed grating image by the measuring object by N times; a light emitting means mounted to a side of the image obtaining means for generating and emitting light with a predetermined wavelength; and a control unit which, by controlling the work stage and the XYZ shaft transfer means, irradiates light generated from the light emitting means mounted to a side of the image obtaining means to the reference surface set the side of the work stage, thereafter receives the reflected light image through the image obtaining means, measures a vertical distance, thereby maintaining a focus distance between the measuring object and the image obtaining means constantly, and receives the changed grating image obtained from the image obtaining means, thereby producing the three-dimensional image.

The image obtaining means comprises: a projection portion which produces a grating image through a light source emitting light and a diffraction grating, in which it is installed to a lower side of the light source for receiving the light emitted from the light source and moved by a grating transfer apparatus, and penetrates the produced grating image through a projection optical system installed to a lower side of the diffraction grating; a distributor, which is installed to a lower side of the projection portion, distributes the grating image irradiated through a projection optical system of the projection portion through first and second mirrors transferred by a mirror transfer apparatus and distributes the grating image through third and fourth mirrors which are installed to be horizontal to the left/right side of the first and second mirrors and first and second filters; and an imaging unit which is installed to a lower side of the distributor, reflects horizontally the changed grating image in which it is penetrated through the first and second filters of the distributor and irritated to the measuring object and then reflected, through an imaging mirror, and obtains the changed grating image through an imaging lens and an imaging device to a camera.

The present invention will become better understood with reference to the accompanying drawings which are given only by way of illustration and thus are not limitative of the present invention, wherein:

FIG. 1 is a construction view of a three-dimensional image measuring apparatus in accordance with the conventional art;

FIG. 2 is a perspective view illustrating the entire construction of a three-dimensional image measuring apparatus in accordance with the present invention;

FIGS. 3 and 4 are construction views of an image obtaining apparatus shown in FIG. 2;

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